Energy of the nearest neighbor RVB state by systematic loop expansion

Details Energy of the nearest neighbor RVB state by systematic loop expansion Energy of the nearest neighbor RVB state by systematic loop expansion

1998-01-22

arxiv.org/abs/cond-mat/9801234v2

Physics

Condensed Matter

Strongly Correlated Electrons

RevTex-file, 4 PRB pages with 2 eps files

Scientific paper

We present an approximation scheme for the calculation of the norm and energy of the nearest-neighbor-RVB state for the Heisenberg antiferromagnet on the 2D square lattice. The approximation leads to a systematic expansion of norm and energy, with the `expansion parameter' being the maximum length of loops taken into account in the calculation of energy and norm. The expansion converges well, the best estimate for the ground state energy/site is $-0.434473J$.

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